What amount of samples to use?
That's about right for something with that many samples =)

You have square samples enabled so it isn't 100, but 9,216 (96 x 96) samples. You should be playing with other things to get the render times down:


Clamping...you are already clamping indirect some, but also try clamping direct a bit.
Try the other performance/sample settings such as filter glossy
Disable all caustics if you don't mind the impact in your image
Reduce the number of bounces for things like glossy and diffuse (especially glossy)


Here are two good articles filled with more tips:

http://www.blenderguru.com/articles/4-easy-ways-to-speed-up-cycles/

http://www.blenderguru.com/articles/7-ways-get-rid-fireflies/